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b in (-oo:+oo)
5*(-(5*b)-2) = -285 // + 285
5*(-(5*b)-2)+285 = 0
5*(-5*b-2)+285 = 0
5*(-5*b-2)+285 = 0
275-25*b = 0
275-25*b = 0
275-25*b = 0 // - 275
-25*b = -275 // : -25
b = -275/(-25)
b = 11
b = 11
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